CN103428818B - Terminal device discovery method, device and system - Google Patents

Abstract

The embodiment of the present invention discloses a method, device and system for discovering terminal equipment, relates to the field of communication technology, and solves the waste of preambles caused when searching for a second terminal equipment, which affects the random access channel performance of other terminal equipment in a base station The problem. The method includes: the first terminal device acquires the synchronization signal information of one or more cells under the base station where the first terminal device or the second terminal device is located, and detects according to the synchronization signal information of the one or more cells The synchronization signal sent by the second terminal device, and obtain the strength of the synchronization signal to discover the second terminal device through the synchronization signal, and the synchronization signal sent by the second terminal device is the one or more One of the synchronization signals of cells. The invention is suitable for use in mobile networks.

Description

Method, device and system for terminal device discovery

technical field

The present invention relates to the field of communication technology, in particular to a method, device and system for discovering terminal equipment.

Background technique

At present, it is a waste of wireless resources to transmit information of two terminal devices with close distances in the network through an evolved base station (Evolved NodeB, eNodeB for short). For example, when transmitting the same amount of data, when two devices with close distances can communicate directly, half of the wireless resources can be saved compared to the communication method transmitted through the base station. This method in which two devices with close distances directly communicate is called device-to-device (D2D for short). Two terminal devices in D2D communication use spectrum resources from the wireless communication network. With the continuous development of smart phones, more and more user devices require short-distance data transmission, such as data sharing or short-distance networked games. Therefore, more and more people pay more and more attention to the device direct connection of the user equipment.

The current method for establishing a D2D network is: if a first terminal device needs to establish a D2D connection with a second terminal device, the first terminal device makes a request to the network where it is located. Multiple base stations of the network search for the second terminal device, and send a paging message to the second terminal device under their respective base stations, and the paging message carries the information assigned by the base station to the second terminal device. The preamble of the terminal device, and at the same time, the base station notifies the first terminal device of the information of the preamble. The second terminal device sends the preamble in a random access channel in the cell network, and the first terminal device detects the preamble sent by the second terminal device in a random access channel in the cell network, After detecting the preamble, judge whether the first terminal device and the second terminal device can perform the D2D connection according to the signal strength of the detected preamble. Specifically, the first terminal device presets a signal strength threshold, and when the signal strength of the preamble is greater than the signal strength threshold, it is determined that the first terminal device and the second terminal device can perform a D2D connection. Finally, the base station sends a D2D mode operation command to the first terminal device and the second terminal device, so that the establishment of the D2D network is completed.

Since multiple base stations need to send paging messages with preambles within their respective ranges when searching for the second terminal, the waste of preambles is caused, and the wasted preambles cannot be used by other paging messages within a period of time. Paging applications affect the random access channel performance of other terminal equipment in the base station.

Contents of the invention

Embodiments of the present invention provide a method, device and system for discovering terminal equipment, which can save preamble resources when a base station searches for the terminal equipment.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

A method for terminal device discovery, comprising:

The first terminal device acquires information about synchronization signals of one or more cells under the base station, where the base station is the base station where the first terminal device or the second terminal device is located;

The first terminal device detects the synchronization signal sent by the second terminal device according to the synchronization signal information of the one or more cells, and acquires the strength of the synchronization signal to discover the second A terminal device, wherein the synchronization signal sent by the second terminal device is one of the synchronization signals of the one or more cells.

A method for terminal device discovery, comprising:

The second terminal device acquires parameter information for sending a synchronization signal, where the synchronization signal is one of synchronization signals of one or more cells under a base station, where the base station is the base station where the second terminal device or the first terminal device is located, The parameter information includes information for sending the synchronization signal;

The second terminal device sends the synchronization signal according to the parameter information, and the synchronization signal is used by the first terminal device to detect the synchronization signal and acquire the strength of the synchronization signal.

A method for terminal device discovery, comprising:

sending a message to the second terminal device, where the message is used to instruct the second terminal device to send a synchronization signal, where the synchronization signal is one of the synchronization signals of one or more cells under the base station, where the base station is the the base station where the second terminal device is located or the base station where the first terminal device is located;

sending information about synchronization signals of one or more cells under the base station to the first terminal device;

receiving indication information sent by the first terminal device, where the indication information includes a judgment result of whether the first terminal device can perform a D2D network connection with the second terminal device as judged by the first terminal device, or The strength information of the synchronization signal received by the first terminal device from the second terminal device.

A first terminal device, comprising:

A first acquiring unit, configured to acquire information about synchronization signals of one or more cells under a base station, where the base station is the base station where the first terminal device or the second terminal device is located;

The first detection unit is configured to detect the synchronization signal sent by the second terminal device according to the synchronization signal information of the one or more cells, and obtain the strength of the synchronization signal to find the synchronization signal through the synchronization signal The second terminal device, the synchronization signal sent by the second terminal device is one of the synchronization signals of the one or more cells.

A second terminal device, comprising:

The second acquisition unit is configured to acquire parameter information for sending a synchronization signal, the synchronization signal being one of the synchronization signals of one or more cells under a base station, the base station being the second terminal device or the first terminal device The base station where the parameter information includes information about sending the synchronization signal;

The second sending unit is configured to send the synchronization signal according to the parameter information, the synchronization signal is used by the first terminal device to detect the synchronization signal, and obtain the strength of the synchronization signal.

A base station, comprising:

A third sending unit, configured to send a message to the second terminal device, where the message is used to instruct the second terminal device to send a synchronization signal, where the synchronization signal is one of synchronization signals of one or more cells under the base station , the base station is the base station where the second terminal device is located or the base station where the first terminal device is located;

a fourth sending unit, configured to send information about synchronization signals of one or more cells under the base station to the first terminal device;

The second receiving unit is configured to receive indication information sent by the first terminal device, where the indication information includes whether the first terminal device can perform direct-to-device communication with the second terminal device judged by the first terminal device The determination result of the network connection, or the strength information of the synchronization signal received by the first terminal device from the second terminal device.

A system for discovering terminal equipment, including a first terminal equipment, a second terminal equipment, and a base station, wherein,

The first terminal device is configured to obtain information about synchronization signals of one or more cells under the base station where the first terminal device or the second terminal device is located, and detect the synchronization signal information of the one or more cells according to the information about the synchronization signals of the one or more cells. The synchronization signal sent by the second terminal device, and obtain the strength of the synchronization signal to discover the second terminal device through the synchronization signal, the synchronization signal sent by the second terminal device is the one or more one of the synchronization signals of the cell;

The second terminal device is configured to obtain parameter information for sending a synchronization signal, where the synchronization signal is one of synchronization signals of one or more cells under a base station, and the base station is the second terminal device or the first The base station where the terminal device is located, the parameter information includes information about sending the synchronization signal, the synchronization signal is sent according to the parameter information, the synchronization signal is used by the first terminal device to detect the synchronization signal, and Obtaining the strength of the synchronization signal;

The base station is configured to send a message to the second terminal device to instruct the second terminal device to send a synchronization signal, where the synchronization signal is one of the synchronization signals of one or more cells under the base station, The base station is the base station where the second terminal device is located or the base station where the first terminal device is located, and sends information about synchronization signals of one or more cells under the base station to the first terminal device, and receives the first terminal device The instruction information sent by the terminal device, the instruction information includes the judgment result of whether the first terminal device can perform D2D network connection with the second terminal device judged by the first terminal device, or the first terminal device receives The received strength information of the synchronization signal from the second terminal device.

In the method, device, and system for discovering terminal equipment provided by the embodiments of the present invention, since the first terminal equipment obtains the synchronization signal information of one or more cells under the base station where the first terminal equipment or the second terminal equipment is located; and according to the one or the synchronization signal information of multiple cells, detect the synchronization signal sent by the second terminal device, and obtain the strength of the synchronization signal to find the second terminal device through the synchronization signal, the embodiment of the present invention adopts The synchronization signal sent by the second terminal device further discovers the second terminal device, which avoids waste of the preamble caused by the use of the preamble, thereby saving preamble resources when the base station searches for the terminal device.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a flow chart 1 of a method for discovering a terminal device provided by an embodiment of the present invention;

FIG. 2 is a second flowchart of a method for terminal device discovery provided by an embodiment of the present invention;

FIG. 3 is a third flowchart of a method for discovering a terminal device provided by an embodiment of the present invention;

FIG. 4 is a first flowchart of a method for discovering a terminal device according to another embodiment of the present invention;

FIG. 5 is a second flowchart of a method for discovering a terminal device according to another embodiment of the present invention;

FIG. 6 is a flowchart 1 of a method for discovering a terminal device according to another embodiment of the present invention;

FIG. 7 is a second flowchart of a method for discovering a terminal device according to another embodiment of the present invention;

FIG. 8 is a first structural schematic diagram of a first terminal device provided by an embodiment of the present invention;

FIG. 9 is a second structural schematic diagram of a first terminal device provided by an embodiment of the present invention;

FIG. 10 is a first structural schematic diagram of a second terminal device provided by an embodiment of the present invention;

FIG. 11 is a second structural schematic diagram of a second terminal device provided by an embodiment of the present invention;

FIG. 12 is a first schematic structural diagram of a base station provided by an embodiment of the present invention;

FIG. 13 is a second structural schematic diagram of a base station provided by an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of a system for terminal device discovery provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In order to make the advantages of the technical solutions of the embodiments of the present invention more clear, the present invention will be described in detail below in conjunction with the drawings and embodiments.

As shown in FIG. 1, the method for discovering a terminal device provided by an embodiment of the present invention is described from the side of the first terminal device, and the method includes:

Step 101, the first terminal device acquires information about synchronization signals of one or more cells under the base station.

Wherein, the base station is a base station where the first terminal device or the second terminal device is located.

Specifically, the first terminal device can learn that the second terminal device may send Synchronization signal information of each cell in order to detect the synchronization signal.

Step 102, the first terminal device detects the synchronization signal sent by the second terminal device according to the synchronization signal information of the one or more cells, and obtains the strength of the synchronization signal to find the synchronization signal through the synchronization signal. the second terminal device.

Wherein, the synchronization signal sent by the second terminal device is one of the synchronization signals of the one or more cells. In the process of the first terminal device performing detection according to the information of the synchronization signal, when the synchronization signal is successfully detected, that is, the strength of the synchronization signal sent by the first terminal device is obtained through detection, indicating that the first terminal device has found the the second terminal device.

Wherein, the synchronization signal may be a primary synchronization signal, a secondary synchronization signal, or a primary synchronization signal and a secondary synchronization signal.

As shown in FIG. 2, the method for discovering a terminal device provided by the embodiment of the present invention is described from the side of the second terminal device, and the method includes:

Step 201, the second terminal device acquires parameter information for sending a synchronization signal.

Wherein, the synchronization signal is one of the synchronization signals of one or more cells under the base station, the base station is the base station where the second terminal device or the first terminal device is located, and the parameter information includes sending the synchronization signal Information.

Step 202, the second terminal device sends the synchronization signal according to the parameter information, and the synchronization signal is used by the first terminal device to detect the synchronization signal and acquire the strength of the synchronization signal.

As shown in Figure 3, the method for discovering terminal equipment provided by the embodiment of the present invention is described from the base station side, and the method includes:

Step 301. Send a message to the second terminal device, where the message is used to instruct the second terminal device to send a synchronization signal.

Wherein, the synchronization signal is one of the synchronization signals of one or more cells under the base station, and the base station is the base station where the second terminal device is located or the base station where the first terminal device is located.

Wherein, the synchronization signal may be a primary synchronization signal, a secondary synchronization signal, or a primary synchronization signal and a secondary synchronization signal.

Step 302: Send the synchronization signal information of one or more cells under the base station to the first terminal device.

Step 303: Receive indication information sent by the first terminal device.

Wherein, the indication information includes the judgment result judged by the first terminal device whether the first terminal device can perform D2D network connection with the second terminal device, or the first terminal device receives the The strength information of the synchronization signal of the terminal device.

It is worth noting that the first terminal device and the second terminal device may be the same terminal device or different terminal devices, and the first terminal device and the second terminal device may be, for example, a mobile phone terminal, a notebook computer, a tablet Computers, etc., but not limited to this.

In the method for discovering terminal devices provided by the embodiments of the present invention, since the first terminal device obtains the synchronization signal information of one or more cells under the base station where the first terminal device or the second terminal device is located; and according to the one or more cells Synchronization signal information, detect the synchronization signal sent by the second terminal device, and obtain the strength of the synchronization signal to discover the second terminal device through the synchronization signal. The embodiment of the present invention uses the second terminal device The transmitted synchronization signal further discovers the second terminal device, which avoids the waste of the preamble caused by the use of the preamble, thereby saving preamble resources when the base station searches for the terminal device.

As shown in FIG. 4, another embodiment of the present invention provides a method for terminal device discovery, the method includes:

Step 401, the first terminal device requests a D2D network connection with the second terminal device from the network where the first terminal device is located.

Wherein, the content of the request may include the identity of the second terminal device. For example, if the second terminal device is a mobile phone terminal, the identity identifier may be a phone number of the second terminal device, but it is not limited thereto.

Wherein, the network where the first terminal device is located may include one or more base stations.

Step 402: One or more base stations in the network where the first terminal device is located send messages to the second terminal device under their respective base stations according to the identity of the second terminal device.

Wherein, the message may be a paging message, and the paging message is used to instruct the second terminal device to send a synchronization signal. The synchronization signal is one of synchronization signals of one or more cells under the base station, and the base station is a base station where the second terminal device is located or a base station where the first terminal device is located.

Wherein, the paging message includes parameter information for sending the synchronization signal, and the parameter information includes information about sending the synchronization signal and a location of frequency resources.

Step 403, the second terminal device receives the message according to the identity.

Specifically, when the second terminal device receives the message sent by the base station, after obtaining the identity, it matches with its own identity, and if the identity is the same, it can know that the base station The sent message is a message for paging the second terminal device.

Step 404, the second terminal device sends the synchronization signal at the time-frequency resource position of the working cell of the second terminal device or the time-frequency resource position of the working cell of the first terminal device.

Wherein, the synchronization signal may be a primary synchronization signal, a secondary synchronization signal, or a primary synchronization signal and a secondary synchronization signal.

Step 405, the first terminal device receives the broadcast message or dedicated signaling sent by the base station, the broadcast message or dedicated signaling includes the synchronization signal information of one or more cells under the base station, or the first terminal device obtains Information about the synchronization signal of the working cell of the first terminal device or the second terminal device, and acquiring the time-frequency resource position where the second terminal device sends the synchronization signal.

Wherein, the working cell of the first terminal device or the second terminal device is one of the one or more cells.

Specifically, the first terminal device may obtain the time-frequency resource location where the second terminal device sends the synchronization signal according to the identity of the second terminal device, wherein the For a specific manner of sending the time-frequency resource location of the synchronization signal by the second terminal device, refer to the subsequent step 412 .

In addition, the first terminal device may also receive a first message sent by the base station, where the first message includes the time-frequency resource position where the second terminal device sends the synchronization signal, but is not limited thereto.

Step 406: The first terminal device is at the position of the time-frequency resource, and detects the synchronization signal according to the synchronization signal information of the working cell of the first terminal device or the second terminal device, and acquires the synchronization signal Strength of. Execute step 407 or step 409.

Wherein, the working cell of the first terminal device or the second terminal device is one of the one or more cells.

Step 407: When the strength of the synchronization signal is greater than a preset signal strength threshold, the first terminal device determines that the first terminal device and the second terminal device work within the coverage of the same base station or the same cell.

In general, the range of two devices for device-through network connection needs to be relatively close (under the same base station), and a strong signal strength is required. Therefore, a pre-set signal strength threshold is used to determine whether two devices are working within the coverage of the same base station or the same cell, and then determine whether a device-through network connection can be made between the two devices.

Step 408, the first terminal device sends a request message to the base station where the first terminal device is located, and the request message includes the coverage of judging whether the first terminal device and the second terminal device work in the same base station or the same cell Judgment results within the range. Then step 411 is executed.

Wherein, if the first terminal device detects the synchronization signal sent by the second terminal device and learns that the strength of the synchronization signal is greater than a preset signal strength threshold, determine that the first terminal device and the second terminal device The devices work within the coverage of the same base station or the same cell.

Step 409, the first terminal device sends a request message to the base station where the first terminal device is located, where the request message includes the strength information of the synchronization signal.

Wherein, the strength information of the synchronization signal is used to enable the base station to know the strength of the synchronization signal.

Step 410, when the base station determines that the strength of the synchronization signal is greater than a preset signal strength threshold, determine that the first terminal device and the second terminal device work within the coverage of the same base station or the same cell. Then step 411 is executed.

Step 411, the base station sends a paging message to the first terminal device and the second terminal device, so that the first terminal device and the second terminal device are based on the working cell of the second terminal device or the The working cell of the first terminal device establishes a radio resource control connection with the base station.

In addition, as shown in FIG. 5, the paging message in the above step 402 may not include the time-frequency resource location where the second terminal device sends the synchronization signal, that is, the parameter information includes information about sending the synchronization signal, For example, an order instructing the second terminal device to send the synchronization signal on the working cell of the second terminal device or the working cell of the first terminal device. Then after the above-mentioned step 403 and before the step 404, the following steps are also required:

Step 412, the second terminal device obtains the time-frequency resource location where the second terminal device sends the synchronization signal according to the identity.

Specifically, for example: the position of the time-frequency resource for sending the synchronization signal is equal to the modulus of the identity identifier to N, where the N value is the number of time-frequency resources that can be used for sending the synchronization signal. The information on the location of the time-frequency resource in the network where the synchronization signal can be sent is broadcast by the base station or can be preset.

For example, the identity of the second terminal device is 123456789, and the number of time-frequency resource positions that can send synchronization signals is 100, then 123456789 is subtracted from 100 to obtain 89, and the second terminal device sends the synchronization signal The time-frequency resource position of is the time-frequency resource position numbered 89.

In addition to the above-mentioned remainder method, other calculation methods may also be used to determine the time-frequency resource position where the second terminal device sends the synchronization signal, which is not limited in the present invention.

In the method for discovering terminal equipment provided by another embodiment of the present invention, since the first terminal equipment obtains the synchronization signal information of one or more cells under the base station where the first terminal equipment or the second terminal equipment is located; and according to the one or more Synchronization signal information of a cell, detect the synchronization signal sent by the second terminal device, and obtain the strength of the synchronization signal to find the second terminal device through the synchronization signal. The embodiment of the present invention adopts the second terminal device. The synchronization signal sent by the terminal device further discovers the second terminal device, which avoids the waste of the preamble caused by the use of the preamble, thereby saving preamble resources when the base station searches for the terminal device.

As shown in FIG. 6, another embodiment of the present invention provides a method for terminal device discovery, the method includes:

Step 501, the second terminal device receives a message sent by the base station, the message sent by the base station is used to instruct the second terminal device to send the synchronization signal, and the message includes parameter information for sending the synchronization signal.

The synchronization signal is one of the synchronization signals of one or more cells under the base station, the base station is the base station where the second terminal device or the first terminal device is located, and the parameter information includes sending the synchronization signal Information.

Wherein, the parameter information includes the transmission period and/or transmission power configured by the base station for the second terminal device to send the synchronization signal. The second terminal device may send the synchronization signal through the working cell of the second terminal device or the working cell of the first terminal device.

Step 502, the second terminal device periodically sends the synchronization signal within a period of time according to the transmission power and/or transmission period.

Wherein, the synchronization signal may be a primary synchronization signal, a secondary synchronization signal, or a primary synchronization signal and a secondary synchronization signal.

Wherein, the second terminal device may send the synchronization signal at a certain period within a certain period of time, for example, once every 1 minute or once every 10 minutes, but it is not limited thereto.

Step 503, the first terminal device obtains information about synchronization signals of one or more cells under the base station.

Wherein, the base station is a base station where the second terminal device or the first terminal device is located.

Specifically, in order to detect the synchronization signal sent by the second terminal device, the first terminal device needs to obtain in advance the synchronization signal information of one or more cells controlled by the base station where the first terminal device is located and the second Synchronization signal information of one or more cells controlled by the base station where the terminal device is located, so as to detect the synchronization signal sent by the second terminal device.

Step 504: When the first terminal device needs to establish a D2D network with the second terminal device, the first terminal device detects that the second terminal device sends a message within the synchronization signal range of the one or more cells. synchronization signal, and obtain the strength of the synchronization signal. Execute step 505 or directly execute step 506.

Step 505, the first terminal device determines whether the first terminal device and the second terminal device work within the coverage of the same base station or the same cell according to the strength of the synchronization signal. Execute step 506.

Specifically, the judging manner may refer to step 407 shown in FIG. 4 , which will not be repeated here.

Step 506: The first terminal device sends a request message to the network where the first terminal device is located, so as to request a D2D network connection with the second terminal device.

Wherein, the request message includes the judgment result of the first terminal device judging whether the first terminal device can perform D2D network connection with the second terminal device according to the strength of the synchronization signal, or includes the The strength of the sync signal.

Step 507: According to the strength of the synchronization signal, the base station where the first terminal device is located determines whether the first terminal device can perform a D2D network connection with the second terminal device, or directly receive the first terminal device The judgment result sent by the device.

Step 508: After determining that the first terminal device is connected to a D2D network with the second terminal device, the base station sends a paging message to the first terminal device and the second terminal device, so that the second terminal device A terminal device and the second terminal device establish a radio resource control connection with a base station according to the working cell of the second terminal device or the working cell of the first terminal device.

In addition, in order to improve the accuracy of judging whether the first terminal device can perform a D2D network connection with the second terminal device, as shown in FIG. 7, another embodiment of the present invention provides a method for discovering a terminal device. Step 504 to step 507 can also be realized through the following steps:

Step 509: When the first terminal device needs to establish a D2D network with the second terminal device, the first terminal device detects that the second terminal device sends a message within the synchronization signal range of the one or more cells. synchronization signal to detect the second terminal device.

Step 510, the first terminal device sends a request message to the network where the first terminal device is located, so as to request a D2D network connection with the second terminal device.

Wherein, the request message includes that the second terminal device has been detected.

Step 511, the base station where the first terminal device is located sends a paging message to the second terminal device.

Wherein, the paging message includes a preamble allocated by the base station to the second terminal device.

Specifically, since the first terminal device has detected the second terminal device, the base station only allocates one preamble to the second terminal device, avoiding allocating a large number of preambles.

Step 512, the base station where the first terminal device is located sends the preamble information to the first terminal device.

Specifically, in order for the first terminal device to detect the preamble sent by the second terminal device, the first terminal device needs to obtain information about the preamble, such as the number of the preamble.

Step 513, the second terminal device sends the preamble, so that the first terminal device receives the preamble, and acquires the signal strength of the preamble. Execute step 514 or step 515.

Step 514: The first terminal device judges whether the first terminal device can perform D2D network connection with the second terminal device according to the signal strength of the preamble, and sends the judgment result to the on the base station. Execute step 508.

Step 515, the first terminal device sends the signal strength of the preamble to the base station where it is located, so that the base station judges whether the first terminal device can communicate with the second terminal device according to the signal strength of the preamble Make a device-through network connection. Execute step 508.

In the method for discovering terminal equipment provided by another embodiment of the present invention, since the first terminal equipment obtains the synchronization signal information of one or more cells under the base station where the first terminal equipment or the second terminal equipment is located; and according to the one or more Synchronization signal information of a cell, detect the synchronization signal sent by the second terminal device, and obtain the strength of the synchronization signal to find the second terminal device through the synchronization signal. The embodiment of the present invention adopts the second terminal device. The synchronization signal sent by the terminal device further discovers the second terminal device, which avoids the waste of the preamble caused by the use of the preamble, thereby saving preamble resources when the base station searches for the terminal device.

As shown in FIG. 8, the first terminal device provided by the embodiment of the present invention includes:

The first obtaining unit 61 is configured to obtain information of synchronization signals of one or more cells under a base station, where the base station is a base station where the first terminal device or the second terminal device is located.

The first detection unit 62 is configured to detect the synchronization signal sent by the second terminal device according to the synchronization signal information of the one or more cells, and obtain the strength of the synchronization signal to find out through the synchronization signal For the second terminal device, the synchronization signal sent by the second terminal device is one of the synchronization signals of the one or more cells.

Further, as shown in FIG. 9, the first terminal device further includes:

The first judging unit 63 is configured to judge whether the first terminal device can perform a D2D network connection with the second terminal device according to the strength of the synchronization signal.

The first sending unit 64 is configured to send the judgment result of the first judging unit 63 or the strength information of the synchronization signal to the base station.

Further, as shown in FIG. 9, the first acquisition unit 61 is specifically used for:

receiving a broadcast message or dedicated signaling sent by the base station, where the broadcast message or dedicated signaling includes information about synchronization signals of one or more cells under the base station; or the first terminal device obtains the first terminal device or Information about a synchronization signal of a working cell of the second terminal device, where the working cell of the first terminal device or the second terminal device is one of the one or more cells.

Further, as shown in FIG. 9, the first judging unit 63 is specifically used for:

When the strength of the synchronization signal is greater than a preset signal strength threshold, it is determined that the first terminal device can perform a D2D network connection with the second terminal device.

Further, as shown in FIG. 9, the first detection unit 62 includes:

The first time-frequency resource position obtaining module 621 is configured to obtain the time-frequency resource position where the second terminal device sends the synchronization signal according to the identity of the second terminal device.

The first receiving module 622 is configured to receive a first message sent by the base station, where the first message includes a time-frequency resource location where the second terminal device sends the synchronization signal.

The first detection module 623 is configured to detect the synchronization signal at the position of the time-frequency resource according to the synchronization signal information of the working cell of the first terminal device or the second terminal device, and acquire the synchronization Signal strength, the working cell of the first terminal device or the second terminal device is one of the one or more cells.

Further, as shown in FIG. 9, the first judging unit 63 is specifically used for:

Judging whether the first terminal device and the second terminal device work within the coverage of the same base station or the same cell according to the strength of the acquired synchronization signal.

Further, as shown in FIG. 9, the first sending unit 64 is specifically used for:

Sending the indication information for judging whether the first terminal device and the second terminal device work within the coverage of the same base station or the same cell as the judgment result to the base station.

Further, as shown in FIG. 9, the first judging unit 63 is specifically used for:

If the synchronization signal sent by the second terminal device is detected and the strength of the synchronization signal is greater than a preset signal strength threshold, determine that the first terminal device and the second terminal device work in the same base station or in the same cell within the coverage.

Further, as shown in FIG. 9, the first sending unit 64 is specifically used for:

Sending a request message to the base station to request a D2D network connection with the second terminal device.

Wherein, the request message includes the judgment result or the strength information of the synchronization signal.

In the first terminal device provided by the embodiment of the present invention, since the first terminal device acquires the synchronization signal information of one or more cells under the base station where the first terminal device or the second terminal device is located; and according to the information of the one or more cells Synchronization signal information, detecting the synchronization signal sent by the second terminal device, and obtaining the strength of the synchronization signal to discover the second terminal device through the synchronization signal, the embodiment of the present invention uses the second terminal device to send The synchronization signal is used to discover the second terminal device, which avoids the waste of the preamble caused by the use of the preamble, so that the resource of the preamble can be saved when the base station searches for the terminal device.

As shown in FIG. 10, the second terminal device provided by the embodiment of the present invention includes:

The second obtaining unit 71 is configured to obtain parameter information for sending a synchronization signal, the synchronization signal being one of the synchronization signals of one or more cells under the base station, the base station being the second terminal device or the first terminal The base station where the device is located, the parameter information includes information about sending the synchronization signal.

The second sending unit 72 is configured to send the synchronization signal according to the parameter information, the synchronization signal is used by the first terminal device to detect the synchronization signal, and obtain the strength of the synchronization signal.

Further, as shown in FIG. 11, the second acquiring unit 71 includes:

The second receiving module 711 is configured to receive a message sent by the base station, where the message includes the parameter information of sending the synchronization signal.

The first obtaining module 712 is configured to obtain the parameter information of the sending synchronization signal according to its own identity.

Further, as shown in FIG. 11 , the parameter information also includes time-frequency resource location information, and the second sending unit 72 is specifically used for:

Sending the synchronization signal at the time-frequency resource position of the working cell of the second terminal device or the time-frequency resource position of the working cell of the first terminal device.

Further, as shown in FIG. 11 , the parameter information also includes the transmission cycle and/or transmission power for sending the synchronization signal, and the second sending unit 72 is specifically configured to:

The synchronization signal is sent periodically within a period of time according to the transmission power and/or transmission cycle.

Further, the second terminal device as shown in Figure 11 further includes:

The first receiving unit 73 is configured to receive a paging message sent by the base station, where the paging message is used to let the second terminal device know that the first terminal device and the second terminal device have D2D Permissions for network connections.

The first connecting unit 74 is configured to, after receiving the paging message, use the working cell of the second terminal device or the working cell of the first terminal device to establish a radio resource control connection with the base station.

It should be noted that the synchronization signal in this embodiment is a primary synchronization signal, a secondary synchronization signal, or a primary synchronization signal and a secondary synchronization signal.

In the second terminal device provided by the embodiment of the present invention, since the first terminal device obtains the synchronization signal information of one or more cells under the base station where the first terminal device or the second terminal device is located; and according to the information of the one or more cells Synchronization signal information, detecting the synchronization signal sent by the second terminal device, and obtaining the strength of the synchronization signal to discover the second terminal device through the synchronization signal, the embodiment of the present invention uses the second terminal device to send The synchronization signal is used to discover the second terminal device, which avoids the waste of the preamble caused by the use of the preamble, so that the resource of the preamble can be saved when the base station searches for the terminal device.

As shown in Figure 12, the base station provided by the embodiment of the present invention includes:

The third sending unit 81 is configured to send a message to the second terminal device, where the message is used to instruct the second terminal device to send a synchronization signal, where the synchronization signal is one of the synchronization signals of one or more cells under the base station One, the base station is the base station where the second terminal device is located or the base station where the first terminal device is located.

The fourth sending unit 82 is configured to send the synchronization signal information of one or more cells under the base station to the first terminal device.

The second receiving unit 83 is configured to receive indication information sent by the first terminal device, where the indication information includes whether the first terminal device can communicate with the second terminal device judged by the first terminal device The judgment result of the direct network connection, or the strength information of the synchronization signal received by the first terminal device from the second terminal device.

Further, as shown in FIG. 13, the indication information is the strength information of the synchronization signal received by the first terminal device, and the base station further includes:

The second determining unit 84 is configured to determine whether the first terminal can perform a D2D network connection with the second terminal device according to the strength of the synchronization signal corresponding to the strength information of the synchronization signal.

Further, as shown in FIG. 13, the fourth sending unit 82 is specifically used for:

Sending a broadcast message or dedicated signaling to the first terminal device, where the broadcast message or dedicated signaling includes synchronization signal information of one or more cells under the base station.

Further, as shown in FIG. 13, the third sending unit 81 is specifically used for:

sending a message to the second terminal device, where the message is parameter information for sending the synchronization signal, and the parameter information includes information about sending the synchronization signal, a time-frequency resource location, a transmission cycle for sending the synchronization signal, and One or more of the transmit powers of the synchronization signal are transmitted.

Further, as shown in FIG. 13, the second judging unit 84 is specifically used for:

Whether the first terminal device can perform a D2D network connection with the second terminal device is determined by judging whether the first terminal device and the second terminal device work within the coverage of the same base station or the same cell.

In the base station provided by the embodiment of the present invention, since the first terminal device obtains the synchronization signal information of one or more cells under the base station where the first terminal device or the second terminal device is located; and according to the synchronization signal information of the one or more cells Information, detect the synchronization signal sent by the second terminal device, and obtain the strength of the synchronization signal to find the second terminal device through the synchronization signal. The embodiment of the present invention uses the synchronization signal sent by the second terminal device Furthermore, the discovery of the second terminal device avoids the waste of the preamble caused by the use of the preamble, so that the resource of the preamble can be saved when the base station searches for the terminal device.

As shown in FIG. 14 , the terminal device discovery system provided by the embodiment of the present invention includes a first terminal device 91, a second terminal device 92, and a base station 93, wherein,

The first terminal device 91 is configured to acquire synchronization signal information of one or more cells under the base station 93 where the first terminal device 91 or the second terminal device 92 is located, and according to the information of the one or more cells Synchronization signal information, detecting the synchronization signal sent by the second terminal device 92, and obtaining the strength of the synchronization signal to find the second terminal device 92 through the synchronization signal, and the second terminal device 92 sends The synchronization signal is one of the synchronization signals of the one or more cells.

The second terminal device 92 is configured to obtain parameter information for sending a synchronization signal, the synchronization signal being one of the synchronization signals of one or more cells under the base station 93, the base station 93 being the second terminal 92 device or the base station 93 where the first terminal device 91 is located, the parameter information includes information about sending the synchronization signal, and the synchronization signal is sent according to the parameter information, and the synchronization signal is used by the first terminal device 91 to detect The synchronous signal is obtained, and the strength of the synchronous signal is acquired.

The base station 93 is configured to send a message to the second terminal device 92 to instruct the second terminal device 92 to send a synchronization signal, where the synchronization signal is a synchronization signal of one or more cells under the base station 93 One of them, the base station 93 is the base station 93 where the second terminal device 92 is located or the base station 93 where the first terminal device 91 is located, and sends to the first terminal device 91 one or more cells under the base station 93 Synchronization signal information, receive the instruction information sent by the first terminal device 91, the instruction information includes whether the first terminal device 91 judged by the first terminal device 91 whether the first terminal device 91 can communicate with the second terminal device 92 The judgment result of the D2D network connection, or the strength information of the synchronization signal received by the first terminal device 91 from the second terminal device 92 .

For the specific implementation manner, refer to the specific embodiments of the first terminal device, the second terminal device, and the base station, which will not be repeated here.

In the system for discovering terminal devices provided by the embodiments of the present invention, since the first terminal device obtains the synchronization signal information of one or more cells under the base station where the first terminal device or the second terminal device is located; and according to the one or more cells Synchronization signal information, detect the synchronization signal sent by the second terminal device, and obtain the strength of the synchronization signal to discover the second terminal device through the synchronization signal. The embodiment of the present invention uses the second terminal device The transmitted synchronization signal further discovers the second terminal device, which avoids the waste of the preamble caused by the use of the preamble, thereby saving preamble resources when the base station searches for the terminal device.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by means of software plus necessary general-purpose hardware, and of course also by hardware, but in many cases the former is a better embodiment . Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, such as a floppy disk of a computer , a hard disk or an optical disk, etc., including several instructions for enabling a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (39)

1. A method for discovering a terminal device, comprising:

the method comprises the steps that a first terminal device obtains information of synchronous signals of one or more cells under a base station, wherein the base station is the base station where the first terminal device or a second terminal device is located;

and the first terminal equipment detects the synchronous signal sent by the second terminal equipment according to the information of the synchronous signals of the one or more cells, acquires the intensity of the synchronous signal to discover the second terminal equipment through the synchronous signal, and the synchronous signal sent by the second terminal equipment is one of the synchronous signals of the one or more cells.

2. The method of claim 1, wherein after obtaining the strength of the synchronization signal, further comprising:

the first terminal equipment judges whether the first terminal equipment can carry out equipment direct connection with the second terminal equipment according to the intensity of the synchronous signal, and sends a judgment result to the base station; or

And the first terminal equipment sends the intensity information of the synchronous signal to the base station.

3. The method of claim 1, wherein the obtaining, by the first terminal device, information of synchronization signals of one or more next cells of the base station comprises:

a first terminal device receives a broadcast message or a dedicated signaling sent by the base station, wherein the broadcast message or the dedicated signaling comprises information of synchronization signals of one or more cells next to the base station; or the first terminal device obtains the information of the synchronization signal of the working cell of the first terminal device or the second terminal device, where the working cell of the first terminal device or the second terminal device is one of the one or more cells.

4. The method of claim 2, wherein the determining, by the first terminal device, whether the first terminal device can perform device-through network connection with the second terminal device according to the strength of the synchronization signal comprises:

and when the intensity of the synchronous signal is greater than a preset signal intensity threshold value, the first terminal equipment judges that the first terminal equipment can be in direct connection with the second terminal equipment.

5. The method according to any one of claims 1 to 4, wherein the detecting, by the first terminal device, the synchronization signal sent by the second terminal device according to the information of the synchronization signals of the one or more cells and obtaining the strength of the synchronization signal comprises:

the first terminal device obtains a time-frequency resource position of the synchronization signal sent by the second terminal device according to an identity of the second terminal device, or the first terminal device receives a first message sent by the base station, wherein the first message contains the time-frequency resource position of the synchronization signal sent by the second terminal device;

the first terminal device is located at the time-frequency resource position, detects the synchronous signal according to the information of the synchronous signal of the working cell of the first terminal device or the second terminal device, and obtains the intensity of the synchronous signal, wherein the working cell of the first terminal device or the second terminal device is one of the one or more cells.

6. The method of claim 2, wherein the determining, by the first terminal device according to the strength of the synchronization signal, whether the first terminal device can perform device-through network connection with the second terminal device, and sending a determination result to the base station, comprises:

and the first terminal equipment judges whether the first terminal equipment and the second terminal equipment work in the coverage area of the same base station or the same cell according to the acquired intensity of the synchronous signal, and sends indication information for judging whether the first terminal equipment and the second terminal equipment work in the coverage area of the same base station or the same cell to the base station as the judgment result.

7. The method of claim 6, wherein the first terminal device determines whether the first terminal device and the second terminal device operate in the coverage area of the same base station or the same cell according to the strength of the acquired synchronization signal, comprising:

and if the first terminal equipment detects the synchronous signal sent by the second terminal equipment and learns that the intensity of the synchronous signal is greater than a preset signal intensity threshold value, determining that the first terminal equipment and the second terminal equipment work in the coverage area of the same base station or the same cell.

8. The method of claim 2, wherein the sending the determination result to the base station comprises:

the first terminal equipment sends a request message to the base station to request the second terminal equipment to carry out equipment direct connection network connection;

the request message includes the determination result or the strength information of the synchronization signal.

9. A method for discovering a terminal device, comprising:

the method comprises the steps that a second terminal device obtains parameter information for sending a synchronous signal, wherein the synchronous signal is one of synchronous signals of one or more cells under a base station, the base station is the base station where the second terminal device or a first terminal device is located, and the parameter information comprises the information for sending the synchronous signal;

and the second terminal equipment sends the synchronous signal according to the parameter information, wherein the synchronous signal is used for detecting the synchronous signal by the first terminal equipment and acquiring the intensity of the synchronous signal.

10. The method of claim 9, wherein the second terminal device obtaining the parameter information of the transmission synchronization signal comprises:

the second terminal equipment receives a message sent by the base station, wherein the message comprises the parameter information of the sending synchronous signal; or,

and the second terminal acquires the parameter information of the sending synchronization signal according to the identity mark of the second terminal.

11. The method according to claim 9 or 10, wherein the parameter information further includes time-frequency resource location information, and the second terminal device sending the synchronization signal according to the parameter information includes:

and the second terminal equipment sends the synchronization signal at the time-frequency resource position of the working cell of the second terminal equipment or the time-frequency resource position of the working cell of the first terminal equipment.

12. The method of claim 10, wherein the parameter information further comprises a transmission period and/or a transmission power for transmitting the synchronization signal.

13. The method of claim 12, wherein the second terminal device transmits the synchronization signal according to the parameter information, and wherein the method comprises:

and the second terminal equipment periodically sends the synchronous signal in a period of time according to the transmission power and/or the transmission period.

14. The method of claim 9, wherein after the second terminal device transmits the synchronization signal according to the parameter information, the method further comprises:

the second terminal device receives a paging message sent by the base station, wherein the paging message is used for enabling the second terminal device to acquire the authority of the first terminal device to perform device-to-device network connection with the second terminal device;

and after receiving the paging message, the second terminal equipment establishes radio resource control connection with a base station by using a working cell of the second terminal equipment or a working cell of the first terminal equipment.

15. A method for discovering a terminal device, comprising:

sending a message to a second terminal device, where the message is used to instruct the second terminal device to send a synchronization signal, where the synchronization signal is one of synchronization signals of one or more cells under a base station, so that a first terminal device detects the synchronization signal sent by the second terminal device and obtains the strength of the synchronization signal to discover the second terminal device through the synchronization signal, where the base station is a base station where the second terminal device is located or a base station where the first terminal device is located;

transmitting information of synchronization signals of one or more cells under the base station to a first terminal device;

receiving indication information sent by the first terminal device, where the indication information includes a determination result that the first terminal device determines whether the first terminal device can perform device-through network connection with the second terminal device, or strength information of the synchronization signal received by the first terminal device from the second terminal device.

16. The method of claim 15, wherein if the indication information is strength information of the synchronization signal received by the first terminal device, after receiving the indication information sent by the first terminal device, further comprising:

and judging whether the first terminal can carry out equipment direct connection network connection with the second terminal equipment or not according to the intensity of the synchronous signal corresponding to the intensity information of the synchronous signal.

17. The method of claim 16, wherein the sending information of synchronization signals of one or more cells under the base station to the first terminal device comprises:

the base station sends a broadcast message or dedicated signaling to the first terminal equipment, wherein the broadcast message or dedicated signaling comprises information of synchronization signals of one or more cells under the base station.

18. The method of claim 16, wherein sending the message to the second terminal device comprises:

and the base station sends a message to the second terminal equipment, wherein the message is parameter information for sending the synchronous signal, and the parameter information comprises one or more of information for sending the synchronous signal, a time-frequency resource position, a transmission period for sending the synchronous signal and transmission power for sending the synchronous signal.

19. The method according to any of claims 16-18, wherein the determining whether the first terminal is capable of device-through network connection with the second terminal device comprises: and judging whether the first terminal equipment and the second terminal equipment can carry out equipment direct connection network connection or not by judging whether the first terminal equipment and the second terminal equipment work in the coverage range of the same base station or the same cell.

20. A first terminal device, comprising:

the first obtaining unit is used for obtaining the information of the synchronous signals of one or more cells under a base station, and the base station is a base station where a first terminal device or a second terminal device is located;

and the first detection unit is configured to detect the synchronization signal sent by the second terminal device according to the information of the synchronization signals of the one or more cells, and acquire the strength of the synchronization signal to discover the second terminal device through the synchronization signal, where the synchronization signal sent by the second terminal device is one of the synchronization signals of the one or more cells.

21. The first terminal device of claim 20, further comprising:

a first judging unit, configured to judge whether the first terminal device can perform device-through network connection with the second terminal device according to the strength of the synchronization signal;

a first sending unit, configured to send the determination result to the base station; or

The first sending unit is further configured to send the strength information of the synchronization signal to the base station.

22. The first terminal device of claim 20, wherein the first obtaining unit is specifically configured to:

receiving a broadcast message or dedicated signaling sent by the base station, wherein the broadcast message or dedicated signaling comprises information of synchronization signals of one or more cells next to the base station; or the first terminal device obtains the information of the synchronization signal of the working cell of the first terminal device or the second terminal device, where the working cell of the first terminal device or the second terminal device is one of the one or more cells.

23. The first terminal device of claim 21, wherein the first determining unit is specifically configured to:

and when the intensity of the synchronous signal is greater than a preset signal intensity threshold value, judging that the first terminal equipment can be in equipment direct connection with the second terminal equipment.

24. The first terminal device according to any of claims 20-23, wherein the first detecting unit comprises:

the first time-frequency resource position acquisition module is used for acquiring the time-frequency resource position of the synchronization signal sent by the second terminal equipment according to the identity of the second terminal equipment;

a first receiving module, configured to receive a first message sent by the base station, where the first message includes a time-frequency resource location of the synchronization signal sent by the second terminal device;

and the first detection module is used for detecting the synchronous signal according to the information of the synchronous signal of the working cell of the first terminal equipment or the second terminal equipment on the time-frequency resource position, and acquiring the intensity of the synchronous signal, wherein the working cell of the first terminal equipment or the second terminal equipment is one of the one or more cells.

25. The first terminal device of claim 21, wherein the first determining unit is specifically configured to:

judging whether the first terminal equipment and the second terminal equipment work in the coverage area of the same base station or the same cell according to the strength of the acquired synchronous signal;

the first sending unit is specifically configured to:

and sending the indication information for judging whether the first terminal equipment and the second terminal equipment work in the coverage area of the same base station or the same cell to the base station as the judgment result.

26. The first terminal device of claim 25, wherein the first determining unit is specifically configured to:

and if the synchronous signal sent by the second terminal equipment is detected and the strength of the synchronous signal is acquired to be larger than a preset signal strength threshold value, determining that the first terminal equipment and the second terminal equipment work in the coverage area of the same base station or the same cell.

27. The first terminal device of claim 21, wherein the first sending unit is specifically configured to:

sending a request message to the base station to request the second terminal device to perform device-through network connection;

the request message includes the determination result or the strength information of the synchronization signal.

28. A second terminal device, comprising:

a second obtaining unit, configured to obtain parameter information for sending a synchronization signal, where the synchronization signal is one of synchronization signals of one or more cells under a base station, the base station is a base station where the second terminal device or the first terminal device is located, and the parameter information includes information for sending the synchronization signal;

and a second sending unit, configured to send the synchronization signal according to the parameter information, where the synchronization signal is used by the first terminal device to detect the synchronization signal, and obtain the strength of the synchronization signal.

29. The second terminal device of claim 28, wherein the second obtaining unit comprises:

a second receiving module, configured to receive a message sent by a base station, where the message includes parameter information of the sending synchronization signal;

and the first acquisition module is used for acquiring the parameter information of the sending synchronization signal according to the identity mark of the first acquisition module.

30. The second terminal device of claim 28 or 29, wherein the parameter information further includes time-frequency resource location information, and the second sending unit is specifically configured to:

and sending the synchronization signal at the time-frequency resource position of the working cell of the second terminal equipment or the time-frequency resource position of the working cell of the first terminal equipment.

31. The second terminal device according to claim 29, wherein the parameter information further comprises a transmission period and/or a transmission power for transmitting the synchronization signal.

32. The second terminal device of claim 31, wherein the second sending unit is specifically configured to:

and periodically sending the synchronous signal according to the transmission power and/or the transmission period in a period of time.

33. The second terminal device of claim 28, further comprising:

a first receiving unit, configured to receive a paging message sent by the base station, where the paging message is used to enable the second terminal device to acquire an authority of the first terminal device to perform device-to-device network connection with the second terminal device;

and the first connection unit is used for establishing radio resource control connection with the base station by using the working cell of the second terminal equipment or the working cell of the first terminal equipment after receiving the paging message.

34. A base station, comprising:

a third sending unit, configured to send a message to a second terminal device, where the message is used to instruct the second terminal device to send a synchronization signal, where the synchronization signal is one of synchronization signals of one or more cells under a base station, so that a first terminal device detects the synchronization signal sent by the second terminal device, and obtains the strength of the synchronization signal to discover the second terminal device through the synchronization signal, where the base station is a base station where the second terminal device is located or a base station where the first terminal device is located;

a fourth sending unit, configured to send information of synchronization signals of one or more cells under the base station to a first terminal device;

a second receiving unit, configured to receive indication information sent by the first terminal device, where the indication information includes a determination result that is determined by the first terminal device whether the first terminal device can perform device-through network connection with the second terminal device, or strength information of the synchronization signal received by the first terminal device from the second terminal device.

35. The base station of claim 34, wherein if the indication information is strength information of the synchronization signal received by the first terminal device, the base station further comprises:

and the second judging unit is used for judging whether the first terminal can carry out the equipment direct connection network connection with the second terminal equipment according to the intensity of the synchronous signal corresponding to the intensity information of the synchronous signal.

36. The base station of claim 35, wherein the fourth sending unit is specifically configured to:

sending a broadcast message or dedicated signaling to the first terminal device, the broadcast message or dedicated signaling comprising information of synchronization signals of one or more cells under the base station.

37. The base station of claim 35, wherein the third sending unit is specifically configured to:

and sending a message to the second terminal device, wherein the message is parameter information for sending the synchronization signal, and the parameter information comprises one or more of information for sending the synchronization signal, a time-frequency resource position, a transmission period for sending the synchronization signal and transmission power for sending the synchronization signal.

38. The base station according to any of claims 35 to 37, wherein the second determining unit is specifically configured to:

and judging whether the first terminal equipment and the second terminal equipment can carry out equipment direct connection network connection or not by judging whether the first terminal equipment and the second terminal equipment work in the coverage range of the same base station or the same cell.

39. A system for terminal device discovery, comprising a first terminal device, a second terminal device, and a base station, wherein,

the first terminal device is configured to acquire information of synchronization signals of one or more cells of a base station where the first terminal device or the second terminal device is located, detect a synchronization signal sent by the second terminal device according to the information of the synchronization signals of the one or more cells, and acquire strength of the synchronization signal to discover the second terminal device through the synchronization signal, where the synchronization signal sent by the second terminal device is one of the synchronization signals of the one or more cells;

the second terminal device is configured to acquire parameter information for sending a synchronization signal, where the synchronization signal is one of synchronization signals of one or more cells under a base station, the base station is the second terminal device or a base station where the first terminal device is located, the parameter information includes information for sending the synchronization signal, the synchronization signal is sent according to the parameter information, and the synchronization signal is used by the first terminal device to detect the synchronization signal and acquire the strength of the synchronization signal;

the base station is configured to send a message to the second terminal device to instruct the second terminal device to send a synchronization signal, where the synchronization signal is one of synchronization signals of one or more cells under the base station, the base station is a base station where the second terminal device is located or a base station where the first terminal device is located, send information of the synchronization signal of the one or more cells under the base station to the first terminal device, and receive indication information sent by the first terminal device, where the indication information includes a determination result that the first terminal device determines whether the first terminal device can perform device-through network connection with the second terminal device, or strength information of the synchronization signal received by the first terminal device from the second terminal device.